U.S. patent application number 10/857748 was filed with the patent office on 2005-06-16 for optical fiber connecting tool, connector holder, connector holder equipped optical connector, and tool equipped optical connector.
This patent application is currently assigned to FUJIKURA LTD.. Invention is credited to Furukawa, Hiroshi, Saito, Daigo, Takizawa, Kazuhiro, Yamaguchi, Takashi.
Application Number | 20050129378 10/857748 |
Document ID | / |
Family ID | 34655469 |
Filed Date | 2005-06-16 |
United States Patent
Application |
20050129378 |
Kind Code |
A1 |
Yamaguchi, Takashi ; et
al. |
June 16, 2005 |
Optical fiber connecting tool, connector holder, connector holder
equipped optical connector, and tool equipped optical connector
Abstract
An optical fiber connecting tool for an optical connector which
houses a ferule, a first optical fiber mounted in the ferule and
extending from a back end of the ferule, and a second optical fiber
abutted and connected to the first optical fiber. the optical
connector includes a clamping portion, provided at a back portion
of the ferule opposite to a distal end surface for abutment
connection and having half split elements, for maintaining
connection between the first optical fiber and the second optical
fiber by clamping the first optical fiber and the second optical
fiber in a space between the half split elements using elastic
force of a spring. The optical fiber connecting tool includes an
insertion member for maintaining a state in which the second
optical fiber is insertable into and removable from the space
between the half split elements by being wedged into the space from
outside of the clamping portion so as to expand the space between
the half split elements, and an insertion member operating portion,
having a ring shape, for extracting the insertion member disposed
between the half split elements of the clamping portion from the
clamping portion.
Inventors: |
Yamaguchi, Takashi;
(Sakura-shi, JP) ; Takizawa, Kazuhiro;
(Sakura-shi, JP) ; Furukawa, Hiroshi; (Sakura-shi,
JP) ; Saito, Daigo; (Sakura-shi, JP) |
Correspondence
Address: |
SUGHRUE MION, PLLC
2100 PENNSYLVANIA AVENUE, N.W.
SUITE 800
WASHINGTON
DC
20037
US
|
Assignee: |
FUJIKURA LTD.
|
Family ID: |
34655469 |
Appl. No.: |
10/857748 |
Filed: |
June 1, 2004 |
Current U.S.
Class: |
385/134 |
Current CPC
Class: |
G02B 6/3898 20130101;
G02B 6/3897 20130101; G02B 6/3869 20130101; G02B 6/3855 20130101;
G02B 6/3858 20130101; G02B 6/3877 20130101; G02B 6/3862
20130101 |
Class at
Publication: |
385/134 |
International
Class: |
G02B 006/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 3, 2003 |
JP |
PAT. 2003-158729 |
Sep 4, 2003 |
JP |
PAT. 2003-313212 |
Claims
What is claimed is:
1. An optical fiber connecting tool for an optical connector which
houses a ferule, a first optical fiber mounted in the ferule and
extending from a back end of the ferule, and a second optical fiber
abutted and connected to the first optical fiber, the optical
connector comprising a clamping portion, provided at a back portion
of the ferule opposite to a distal end surface for abutment
connection and having half split elements, for maintaining
connection between the first optical fiber and the second optical
fiber by clamping the first optical fiber and the second optical
fiber in a space between the half split elements using elastic
force of a spring, the optical fiber connecting tool comprising: an
insertion member for maintaining a state in which the second
optical fiber is insertable into and removable from the space
between the half split elements by being wedged into the space from
outside of the clamping portion so as to expand the space between
the half split elements; an insertion member operating portion,
having a ring shape, for extracting the insertion member disposed
between the half split elements of the clamping portion from the
clamping portion; and a stopper wall, included in a periphery of
the insertion member operating portion, to which the optical
connector is abutted when the insertion member is extracted from
the clamping portion of the optical connector, wherein the
insertion member projects to an outer surface side of the stopper
wall from a movable end portion, which is an end portion of the
insertion member operating portion located opposite to the stopper
wall of the insertion member operating portion, through an
insertion member window formed in the stopper wall, and when
lateral opposing forces are applied to portions of the insertion
member operating portion located between the stopper wall and the
movable end portion, the insertion member operating portion deforms
such that a distance between the stopper wall and the movable end
portion increases so that the insertion member is moved such that
an amount of projection of the insertion member from the stopper
wall decreases or projection of the insertion member from the
stopper wall is eliminated.
2. An optical fiber connecting tool according to claim 1, wherein
the connector holder further comprises a holder body having a
groove-shaped accommodation recess for accommodating the optical
connector, and the insertion member operating portion has a
structure in which the holder body and the movable end portion are
joined by a pair of joining walls each of which comprises two
joining plates joined by a hinge, so that the pair of joining walls
deforms uniformly so as to allow the insertion members to move
linearly with respect to the optical connector held in the holder
body when the lateral opposing forces are applied to the insertion
member operating portion.
3. An optical fiber connecting tool according to claim 1,
comprising plural insertion members to be inserted between the
elements of the clamping portion, which project from the movable
end portion.
4. An optical fiber connecting tool according to claim 1, wherein
the connector holder further comprises a holder body having a
groove-shaped accommodation recess that accommodates the optical
connector, the insertion member operating portion has a polygonal
shape that has a concave portion as viewed in a direction along
which groove-shaped accommodation recess extends, and the stopper
wall forms a portion of the concave portion.
5. A connector holder comprising: a holder body having a
groove-shaped accommodation recess for accommodating an optical
connector which houses a ferule, a first optical fiber mounted in
the ferule and extending from a back end of the ferule, and a
second optical fiber abutted and connected to the optical fiber,
the optical connector comprising a clamping portion, provided at a
back portion of the ferule opposite to a distal end surface for
abutment connection and having half split elements, for maintaining
connection between the first optical fiber and the second optical
fiber by clamping the first optical fiber and the second optical
fiber in a space between the half split elements using elastic
force of a spring; an insertion member operating portion, having a
ring shape, in which the holder body is included as a portion of a
periphery thereof; and an insertion member projecting from a
movable end portion, which is an end portion of the insertion
member operating portion located opposite to the holder body, into
the accommodation recess, for maintaining a state in which the
second optical fiber is insertable into and removable from the
space between the half split elements by being wedged into the
space from outside of the clamping portion so as to expand the
space between the half split elements, wherein the insertion member
operating portion extracts the insertion member disposed between
the half split elements from the space between the half split
elements by being applied lateral opposing forces to portions of
the insertion member operating portion located between the holder
body and the movable end portion, and thereby deforming such that a
distance between the movable end portion and the holder body.
6. A connector holder according to claim 5, wherein the deformation
of the insertion member operating portion is an elastic
deformation.
7. A connector holder according to claim 5, wherein the insertion
member operating portion has a structure in which the holder body
and the movable end portion are joined by a pair of joining walls
each of which comprises two joining plates joined by a hinge, so
that the pair of joining walls deforms uniformly so as to allow the
insertion members to move linearly with respect to the optical
connector held in the holder body when the lateral opposing forces
are applied to the insertion member operating portion.
8. A connector holder according to claim 5, comprising plural
insertion members to be inserted between the elements of the
clamping portion, which project from the movable end portion.
9. A connector holder according to claim 5, wherein a convex
portion, which is engageable with a retainer for holding the
optical connector in the accommodation recess, is formed on an end
of the holder body located opposite to the insertion member
operating portion.
10. A connector holder according to claim 5, wherein an engagement
groove, which is engageable with a retainer for holding the optical
connector in the accommodation recess, is formed in an end of the
holder body located opposite to the insertion member operating
portion.
11. A connector holder equipped optical connector comprising: an
optical connector which houses a ferule, a first optical fiber
mounted in the ferule and extending from a back end of the ferule,
and a second optical fiber abutted and connected to the optical
fiber, the optical connector comprising a clamping portion,
provided at a back portion of the ferule opposite to a distal end
surface for abutment connection and having half split elements, for
maintaining connection between the first optical fiber and the
second optical fiber by clamping the first optical fiber and the
second optical fiber in a space between the half split elements
using elastic force of a spring; and a connector holder according
to claim 5 mounted on the optical connector, wherein the insertion
member of the connector holder is disposed between the half split
elements of the clamping portion.
12. A tool equipped optical connector comprising: an optical
connector which houses a ferule, a first optical fiber mounted in
the ferule and extending from a back end of the ferule, and a
second optical fiber abutted and connected to the optical fiber,
the optical connector comprising a clamping portion, provided at a
back portion of the ferule opposite to a distal end surface for
abutment connection and having half split elements, for maintaining
connection between the first optical fiber and the second optical
fiber by clamping the first optical fiber and the second optical
fiber in a space between the half split elements using elastic
force of a spring; and an optical fiber connecting tool according
to claim 1, wherein the insertion member is disposed between the
half split elements of the clamping portion of the optical
connector.
13. An optical fiber connecting tool for a clamping portion having
half split elements for maintaining connection between optical
fibers which are abutted and connected by clamping the optical
fibers in a space between the half split elements using elastic
force of a spring, the optical fiber connecting tool comprising: an
insertion member for maintaining a state in which one of the
optical fibers is insertable into and removable from the space
between the half split elements by being wedged into the space from
outside of the clamping portion so as to expand the space between
the half split elements; an insertion member operating portion for
extracting the insertion member disposed between the half split
elements of the clamping portion from the clamping portion; and a
stopper wall, joining peripheral ends of the insertion member
operating portion, to which the clamping portion is abutted when
the insertion member is extracted from the clamping portion,
wherein the insertion member projects to an outer surface side of
the stopper wall from a movable end portion, which is an end
portion of the insertion member operating portion located opposite
to the stopper wall of the insertion member operating portion,
through an insertion member window formed in the stopper wall, and
when lateral opposing forces are applied to portions of the
insertion member operating portion located between the stopper wall
and the movable end portion, the insertion member operating portion
deforms such that a distance between the stopper wall and the
movable end portion increases so that the insertion member is moved
such that an amount of projection of the insertion member from the
stopper wall decreases or projection of the insertion member from
the stopper wall is eliminated.
14. An optical fiber connecting tool according to claim 13, wherein
the stopper wall is provided on a holder body which accommodates
the clamping portion.
15. A tool equipped optical connector comprising: a clamping
portion having half split elements for maintaining connection
between optical fibers which are abutted and connected by clamping
the optical fibers in a space between the half split elements using
elastic force of a spring; and an optical fiber connecting tool
according to claim 13 attached to the clamping portion so as to
maintain a state in which one of the optical fibers is insertable
into and removable from the space between the half split elements
by inserting the insertion member into the space from outside of
the optical connector so as to expand the space between the half
split elements.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to an optical fiber connecting
tool having a mechanism for connecting optical fibers together and
used for an optical connector which is easily assembled with an
optical fiber at a distal end of the optical fiber using the
mechanism, and also relates to a connector holder, a connector
holder equipped optical connector, and a tool equipped optical
connector.
[0003] Priority is claimed on Japanese Patent Application No.
2003-158729, filed Jun. 3, 2003, and Japanese Patent Application
No. 2003-313212, filed Sep. 4, 2003, the contents of which are
incorporated herein by reference.
[0004] 2. Description of Related Art
[0005] In recent years, an optical connector that allows carrying
out the operation of the attachment to the distal end of an optical
fiber at a connection site outside a factory is known. For example,
there is an optical connector including a ferule in which an
optical fiber is housed in advance and polished at a distal end
surface thereof, and a clamping portion disposed at the back (the
position opposite to the distal end surface) of the ferule. The
optical fiber housed in the ferule and another optical fiber to be
connected are abutted and connected at the clamping portion by
clamping these optical fibers in half split elements of the
clamping portion, so that assembling of the optical connector in a
short time is allowed. Here, because the size of the clamping
portion is small, a dedicated tool that carries out opening and
closing the elements (optical connector assembling tool) has been
proposed (refer, for example, to Japanese Unexamined Patent
Application, First Publication No.2002-23006 and Japanese
Unexamined Patent Application, First Publication No.
2002-55259).
[0006] However, it is necessary that the optical connector
attachment tool having the structure described above be precisely
formed so that a wedge that has undergone high precision processing
can be correctly inserted and released between the small-sized
elements in order to realize the operation of the clamping portion
of the optical connector, and thus there is a problem in that cost
reductions are difficult. In addition, in the clamping portion
described above, a comparatively great effort is required in both
the insertion and release of the wedge in the elements due to the
clamping force of a spring that imparts a clamping force to the
elements, and thus in consideration of this point, the optical
connector assembling tool described above must function so that the
insertion and release operability of the wedge in the elements is
guaranteed, and thus there are problems in that downsizing and cost
reductions are difficult. With regard to size, the optical
connector assembling tool described above may also encounter a case
in which the optical connector assembling tool cannot be inserted
in a narrow operation space such as a device casing. In addition,
when a connector is to be attached to a distal end of an optical
fiber using the optical connector assembling tool disposed outside
a device casing, there may be disadvantage in that it is necessary
that the extra extraction length for extracting the optical fiber
from the device casing be guaranteed.
SUMMARY OF THE INVENTION
[0007] In consideration of the above problems, an object of the
present invention is to provide an optical fiber connecting tool
which enables assembling operation of an optical connector to a
distal end of an optical fiber at low cost, and to provide a
connector holder, an optical holder equipped optical connector, and
tool equipped optical connector.
[0008] The present invention provides the structure described below
in order to achieve the objects and to solve the problems described
above.
[0009] A first aspect of the present invention provides an optical
fiber connecting tool for an optical connector which houses a
ferule, a first optical fiber mounted in the ferule and extending
from a back end of the ferule, and a second optical fiber abutted
and connected to the optical fiber, the optical connector including
a clamping portion, provided at a back portion of the ferule
opposite to a distal end surface for abutment connection and having
half split elements, for maintaining connection between the first
optical fiber and the second optical fiber by clamping the first
optical fiber and the second optical fiber in a space between the
half split elements using elastic force of a spring, the optical
fiber connecting tool including: an insertion member for
maintaining a state in which the second optical fiber is insertable
into and removable from the space between the half split elements
by being wedged into the space from outside of the clamping portion
so as to expand the space between the half split elements; an
insertion member operating portion, having a ring shape, for
extracting the insertion member disposed between the half split
elements of the clamping portion from the clamping portion; and a
stopper wall, included in a periphery of the insertion member
operating portion, to which the optical connector is abutted when
the insertion member is extracted from the clamping portion of the
optical connector, wherein the insertion member projects to an
outer surface side of the stopper wall from a movable end portion,
which is an end portion of the insertion member operating portion
located opposite to the stopper wall of the insertion member
operating portion, through an insertion member window formed in the
stopper wall, and when lateral opposing forces are applied to
portions of the insertion member operating portion located between
the stopper wall and the movable end portion, the insertion member
operating portion deforms such that a distance between the stopper
wall and the movable end portion increases so that the insertion
member is moved such that an amount of projection of the insertion
member from the stopper wall decreases or projection of the
insertion member from the stopper wall is eliminated.
[0010] The connector holder may further include a holder body
having a groove-shaped accommodation recess that accommodates the
optical connector. The insertion member operating portion may have
a polygonal shape that has a concave portion as viewed in a
direction along which groove-shaped accommodation recess extends.
The stopper wall may form a portion of the concave portion.
[0011] In addition, a second aspect of the present invention
provides a connector holder including: a holder body having a
groove-shaped accommodation recess for accommodating an optical
connector which houses a ferule, a first optical fiber mounted in
the ferule and extending from a back end of the ferule, and a
second optical fiber abutted and connected to the optical fiber,
the optical connector including a clamping portion, provided at a
back portion of the ferule opposite to a distal end surface for
abutment connection and having half split elements, for maintaining
connection between the first optical fiber and the second optical
fiber by clamping the first optical fiber and the second optical
fiber in a space between the half split elements using elastic
force of a spring; an insertion member operating portion, having a
ring shape, in which the holder body is included as a portion of a
periphery thereof; and an insertion member projecting from a
movable end portion, which is an end portion of the insertion
member operating portion located opposite to the holder body, into
the accommodation recess, for maintaining a state in which the
second optical fiber is insertable into and removable from the
space between the half split elements by being wedged into the
space from outside of the clamping portion so as to expand the
space between the half split elements, wherein the insertion member
operating portion extracts the insertion member disposed between
the half split elements from the space between the half split
elements by being applied lateral opposing forces to portions of
the insertion member operating portion located between the holder
body and the movable end portion, and thereby deforming such that a
distance between the movable end portion and the holder body.
[0012] The deformation of the insertion member operating portion is
preferably an elastic deformation.
[0013] In the connector holder according to the present invention,
the insertion member operating portion can also have a structure in
which the insertion member operating portion can deform as a whole
due to lateral pressure acting from both sides opposite to the
portion positioned between the movable end portion and the holder
body, and thereby the distance between the movable end portion and
the holder body increases. In addition, the insertion member
operating portion can have a structure in which the holder body and
the movable end portion joined due to a pair of joining walls
having a configuration in which two connecting plates are joined by
a hinge portion, or can have a structure in which a pair of joining
wall portions deform equally due to the lateral pressure acting on
the insertion member operating portion and thereby the insertion
members are moved linearly towards the optical connector held in
the holder body. In addition, a structure can be used in which
insertion members that are to be wedged between elements of the
clamping portion can be erected in plurality on the movable end
portion.
[0014] In the connector holder, a convex portion, which is
engageable with a retainer for holding the optical connector in the
accommodation recess, may be formed on an end of the holder body
located opposite to the insertion member operating portion. In
addition, an engagement grove, which is engageable with a retainer
for holding the optical connector in the accommodation recess, may
be formed in an end of the holder body located opposite to the
insertion member operating portion.
[0015] In addition, the present invention provides a connector
holder equipped optical connector including: an optical connector
which houses a ferule, a first optical fiber mounted in the ferule
and extending from a back end of the ferule, and a second optical
fiber abutted and connected to the optical fiber, the optical
connector including a clamping portion, provided at a back portion
of the ferule opposite to a distal end surface for abutment
connection and having half split elements, for maintaining
connection between the first optical fiber and the second optical
fiber by clamping the first optical fiber and the second optical
fiber in a space between the half split elements using elastic
force of a spring; and a connector holder according to the second
aspect on the optical connector, wherein the insertion member of
the connector holder is disposed between the half split elements of
the clamping portion.
[0016] In addition, the present invention provides a tool equipped
optical connector including: an optical connector which houses a
ferule, a first optical fiber mounted in the ferule and extending
from a back end of the ferule, and a second optical fiber abutted
and connected to the optical fiber, the optical connector including
a clamping portion, provided at a back portion of the ferule
opposite to a distal end surface for abutment connection and having
half split elements, for maintaining connection between the first
optical fiber and the second optical fiber by clamping the first
optical fiber and the second optical fiber in a space between the
half split elements using elastic force of a spring; and an optical
fiber connecting tool according the first aspect, wherein the
insertion member is disposed between the half split elements of the
clamping portion of the optical connector.
[0017] In addition, a third aspect of the present invention
provides an optical fiber connecting tool for a clamping portion
having half split elements for maintaining connection between
optical fibers which are abutted and connected by clamping the
optical fibers in a space between the half split elements using
elastic force of a spring, the optical fiber connecting tool
including: an insertion member for maintaining a state in which one
of the optical fibers is insertable into and removable from the
space between the half split elements by being wedged into the
space from outside of the clamping portion so as to expand the
space between the half split elements; an insertion member
operating portion for extracting the insertion member disposed
between the half split elements of the clamping portion from the
clamping portion; and a stopper wall, joining peripheral ends of
the insertion member operating portion, to which the clamping
portion is abutted when the insertion member is extracted from the
clamping portion, wherein the insertion member projects to an outer
surface side of the stopper wall from a movable end portion, which
is an end portion of the insertion member operating portion located
opposite to the stopper wall of the insertion member operating
portion, through an insertion member window formed in the stopper
wall, and when lateral opposing forces are applied to portions of
the insertion member operating portion located between the stopper
wall and the movable end portion, the insertion member operating
portion deforms such that a distance between the stopper wall and
the movable end portion increases so that the insertion member is
moved such that an amount of projection of the insertion member
from the stopper wall decreases or projection of the insertion
member from the stopper wall is eliminated.
[0018] In the optical fiber connecting tool described above, the
stopper wall may be provided on a holder body which accommodates
the clamping portion.
[0019] The present invention further provides a tool equipped
optical connector including: a clamping portion having half split
elements for maintaining connection between optical fibers which
are abutted and connected by clamping the optical fibers in a space
between the half split elements using elastic force of a spring;
and an optical fiber connecting tool according to the third aspect
attached to the clamping portion so as to maintain a state in which
one of the optical fibers is insertable into and removable from the
space between the half split elements by inserting the insertion
member into the space from outside of the optical connector so as
to expand the space between the half split elements.
[0020] The "stopper wall" in the first and third aspects of the
invention functions to realize the smooth extraction of the
insertion member from the space between the elements by preventing
movement in which the optical connector follows the insertion
member when the insertion member is extracted from the space
between the elements of the clamping portion of the optical
connector by operating the insertion member operating portion.
[0021] The "holder body" according to the second aspect of the
invention also has a function similar to that of the stopper wall
described above, and in the present specification, the term
"stopper wall" also includes the holder body. The connector holder
according to the present invention doubles as an optical fiber
connection tool according to the present invention. In addition,
the connector holder equipped optical connector according to the
present invention doubles as the tool equipped optical connector
according to the present invention.
[0022] In the present invention, the distance between the movable
end portion and the stopper wall is increased by applying lateral
pressure from both sides opposite to the part of the insertion
member operating portion positioned between the movable end portion
and the stopper wall (below, referred to as side portion; there are
a pair of side portions positioned between the movable end portion
and the stopper wall on the ring-shaped insertion member operating
portion), and elastically deforming the insertion member operating
portion so as to make the end portions on both sides of the
insertion member operating portion approach each other. Thereby,
the insertion members that have been placed between the elements
can be extracted from between the elements. The insertion member
operating portion functions so that the lateral pressure acting on
the insertion member operating portion is transformed to a force in
the direction perpendicular to the lateral pressure, and thus the
insertion members can be extracted from between the elements. The
insertion member operating portion functions to realize extraction
of the insertion members from between the elements by a weak force
in comparison to extracting the insertion members from between the
elements directly.
[0023] In the present invention, in comparison to a conventional
dedicated tool, it is possible to realize a connection between
optical fibers in the clamping portion that does not use a
conventional dedicated tool by using a connector holder equipped
optical connector (or a tool equipped optical connector) that is
attached by using a connector holder (or an optical fiber
connecting tool) having a structure that is extremely simple and
can be downsized. Thereby, it is possible to realize the attachment
of the optical connector to the distal end of the optical fiber
easily. In addition, the structure of the optical fiber connecting
tool and connector holder is extremely simple, and furthermore can
be fabricated inexpensively. Thus, in comparison to using a
dedicated tool, it is possible to realize large reductions in
cost.
[0024] Furthermore, the connector holder equipped optical connector
and the tool equipped optical connector can realize the attachment
of the optical connector to the distal end of the optical fiber
simply by extracting the insertion members from the clamp of the
optical connector by operating the insertion member operating
portion after inserting the optical fiber into the clamping portion
of the optical connector, and thus the operation of carrying out
precise positioning and support by fitting the optical connector
into the holder portion, which requires using a conventional
dedicated tool, becomes unnecessary, and thus the attachment
operation becomes extremely simple.
[0025] In addition, in the present invention, the insertion member
operating portion functions to convert the lateral pressure acting
on the insertion member operating portion to a force in a direction
perpendicular to the lateral pressure and extract the insertion
members from between the elements, and thus in comparison to
extracting the insertion members from between the elements
directly, the extraction of the insertion members from between the
elements can be realized by a weak force. Thereby, the extraction
of the insertion members from between the elements can be carried
out simply and comfortably. In addition, the insertion member
operating portion has an extremely simple structure, and thus the
optical connector equipped insertion member tool, a connector
holder, a connector holder equipped optical connector, a connector
holder equipped optical connector, and a tool equipped optical
connector can be downscaled.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] FIG. 1 is a perspective view showing a connector holder
equipped optical connector and a connector holder according to an
embodiment of the present invention.
[0027] FIG. 2 is a perspective view showing the connector holder
shown in FIG. 1.
[0028] FIG. 3 is a drawing showing a state in which insertion
members are extracted from a clamping portion of the optical
connector (an optical connector plug) by applying lateral pressure
to an insertion member operating portion of the connector holder of
the connector holder equipped optical connector so as to deform the
insertion member operating portion.
[0029] FIG. 4 is a perspective view showing the holder equipped
connector holder shown in FIG. 1.
[0030] FIG. 5 is an exploded perspective view of the optical
connector (optical connector plug) that forms the connector holder
equipped optical connector shown in FIG. 1.
[0031] FIG. 6 is a cross-sectional view showing the optical
connector (optical connector plug) shown in FIG. 5.
[0032] FIG. 7 is a perspective view showing the clamping portion
equipped ferule which is housed in the optical connector shown in
FIG. 5.
[0033] FIG. 8 is a drawing showing abutment surfaces of each of the
elements that form the clamping portion of the clamping portion
equipped ferule shown in FIG. 7.
[0034] FIG. 9 is a perspective view showing another embodiment of
the insertion members.
[0035] FIGS. 10A and 10B are side views showing another embodiment
of distal ends of the insertion members.
[0036] FIG. 11 is a perspective view showing another embodiment of
the connector holder.
[0037] FIG. 12 is a perspective view showing a retainer used for
holding the optical connector in the connector holder.
[0038] FIG. 13 is a front view showing a state in which the optical
connector is accommodated in the connector holder shown in FIG. 11
and the insertion members are wedged into a space between a pair of
elements.
[0039] FIG. 14 is a front view showing a state in which the
retainer shown in FIG. 12 is attached to the connector holder shown
in FIG. 11.
[0040] FIG. 15 is a front view showing a state in which the
retainer shown in FIG. 12 is attached to the connector holder shown
in FIG. 11.
[0041] FIG. 16 is a front view showing a state in which the
retainer is attached to the connector holders shown in FIG. 1 to
FIG. 3.
[0042] FIG. 17 is a side view showing yet another embodiment of a
connector holder.
DETAILED DESCRIPTION OF THE INVENTION
[0043] An embodiment of the present invention will be explained
below with reference to the appended drawings.
[0044] FIG. 1 is a perspective view showing the connector holder
equipped optical connector 1 (a tool equipped optical connector)
and the connector holder 2 (an optical fiber connector tool)
according to an embodiment of the present invention; FIG. 2 is a
perspective view showing the connector holder 2; FIG. 3 is a front
view showing the connector holder equipped optical connector 1 and
the connector holder 2 viewed in a partial cross-section; and FIG.
4 is a drawing showing a state in which insertion members 21 are
extracted from a clamping portion 32 of the optical connector 3 (an
optical connector plug) by applying lateral pressure to the
insertion member operating portion 23 shown in FIG. 3 so as to
deform the insertion member operating portion 23.
[0045] As shown in FIG. 1 to FIG. 3, the connector holder equipped
optical connector 1 is formed by mounting the connector holder 2 on
the outside of the optical connector 3. The optical connector plug
3 in the illustrated example is what is termed SC2 type optical
connector, and from the SC type optical connector (SC: single fiber
coupling optical fiber connector, such as an F04 type optical
connector (optical connector plug) defined in the JIS C 5973), the
latch mounted on the outside of the plug frame 33 (refer to FIG. 5)
of the SC type optical connector is omitted. Note that the optical
connector 3 is not limited to the SC2 type optical connector
described above, but various optical connectors such as a single
core type optical connector plug, a multiple-core type optical
connector plug, or the like may be used.
[0046] First, the optical connector 3 will be explained.
[0047] FIG. 5 and FIG. 6 are drawings showing the structure of the
optical connector 3, in particular, FIG. 5 is an exploded
perspective view and FIG. 6 is a cross-sectional view. In FIGS. 5
and 6, the optical connector 3 includes a ferule 31; a clamping
portion 32 that is disposed at the back end side opposite to the
connection surface end (reference symbol 31a; the distal end
surface) of the ferule 31; a sleeve shaped plug frame 33 that on
the is mounted outside the ferule 31 so as to accommodate the
ferule 31 while restraining rotation of the ferule 31 about the
axis thereof; a stop ring 34 that is attached by engagement to the
back end (right side in FIG. 6) of the plug frame 33 and
accommodates the clamping portion 32; and a spring 35 that is
mounted inside the stop ring 34.
[0048] Note that reference symbols 34a and 34b denote the insertion
opening in which the insertion members 21 (refer to FIG. 4 and the
like) of the connector holder 2 (release member), and reference
symbol 36 denotes boots mounted on the back end of the stop ring
34.
[0049] The clamping portion 32 is formed by attaching plural
members to an extension portion 31c that extends from a flange
portion 31b of the ferule 31 towards the back end side of the
optical connector 3. The clamping portion 32 is integrally formed
with the ferule 31, and hereinafter, the ferule 31 to which the
clamping portion 32 is attached may be referred to as a "clamping
portion equipped ferule 37".
[0050] The clamping portion 32 of the clamping portion equipped
ferule 37 is accommodated in the stop ring 34 while being allowed
to freely move in the axial direction of the sleeve shaped stop
ring 34. The spring 35 receives a reaction force from the back end
side of the stop ring 34 to press the distal end side (the left
side in FIG. 6) of the optical connector 3, and thereby the entire
clamping portion equipped ferule 37 is urged towards the back end
side of the optical connector 3, and for example, when the optical
connector 3 is connected to a separate optical connector by being
inserted into an optical connector adaptor or the like, the spring
35 functions to impart an abutment force between the optical
connector 3 and the optical connector on the connection partnering
side.
[0051] Note that further movement (the movement relative to the
stop ring 34) of the clamping portion equipped ferule 37 towards
the back end side of the optical connector 3 with respect to the
stop ring 34 is restrained by the flange portion 31b of the ferule
31 abutting the stopper projection 33a that projects in the plug
frame 33.
[0052] FIG. 7 is a perspective view showing the clamp equipped
ferule 37, and FIG. 8 is a drawing showing abutment surfaces of the
two lid elements 321a and 321b and the base side element (extension
portion 31c) that form the clamping portion of the clamp equipped
ferule 37.
[0053] As shown in FIG. 6 to FIG. 8, the clamping portion 32 is
formed by accommodating the extension portion 31c that extends from
the flange portion 31b of the ferule 31 and the lid elements 321a
and 321b that are disposed on an abutment surface 324a of the
extension portion 31c inside of the sleeve shaped spring 322 having
a C shaped cross-section (C-shaped spring).
[0054] The extension portion 31c forms one of half split elements
(hereinafter sometimes referred to as an element 31a) that form the
clamping portion 32, and the two lid elements 321a and 321b form
the other (element 321) of the half split elements that forms that
forms the clamping portion 32. The clamping portion 32 has a
structure in which an optical fiber is clamped between the pair of
half split elements 31a and 321. The two lid elements 321a and 321b
are arranged along the optical connector 3 (right to left in the
FIG. 6) such that one (the element 321a) is closer to the ferule 31
side than the other (the element 321b).
[0055] The spring 322 is configured such that elasticity of the
spring 322 acts separately on the two lid elements 321a and 321b by
the slit 322 formed in the spring 322 in proximity to the border
between the two lid elements 321a and 321b. Accordingly, one set
consisting of the lid element 31a and the extension portion 31c and
the other set consisting of lid element 321b and the extension
portion 31c each can function as an independent clamping
portion.
[0056] In the connector holder equipped optical connector 1
according to the present invention, the insertion members 21 of the
connector holder 2 (refer to FIG. 3 and FIG. 4) are wedged between
the pair of elements 31c and 321 (that is, between the abutment
surface opposite to the element 321 of the extension portion 31c
and the abutment surface opposite to the element 31c of the lid
elements 321 and 322) via the insertion openings 34a and 34b of the
stop ring from outside the optical connector, and the pair of
elements 31c and 321 are slightly pushed open due to resisting the
elasticity of the spring 322.
[0057] In addition, the two insertion openings 34a and 34b of the
stop ring 34 open at the position that corresponds to the two
clamping portions that correspond to the two lid side elements 321,
and two insertion members 21 project from a bottom wall 22e of a
holder body 22 into the accommodation recess 22a are wedged between
the element 31c and the element 321a through the two insertion
openings 34a and 34b, respectively.
[0058] The distal end of the insertion member 21 in the present
embodiment is formed so as to have a curved shape, as shown in FIG.
3 and FIG. 4. However, the distal end shape of the insertion member
21 is not limited to this. Other shapes may be employed as long as
a state in which the pair of elements 31c and 321 are slightly
pushed open due to resisting the elasticity of the spring 322 by
wedging the insertion members 21 between the pair of elements 31c
and 321 can be maintained. Other examples of shapes for the
insertion member 21 will be separately explained with reference to
FIGS. 10A and 10B.
[0059] Note that a variety of shapes can be used for the spring
322, such as one having a U-shape in cross-section.
[0060] Next, the connector holder 2 will be explained with
reference to FIG. 1 to FIG. 4.
[0061] As shown in FIG. 1 to FIG. 4, the connector holder 2
includes a holder body 22 that is attached outside the optical
connector 3; a ring-shaped insertion member operating portion 23
that projects beyond the holder body 22; and, in the insertion
member operating portion 23, insertion members 21 that project from
the movable end portion 24, which is an end portion on the side
opposite to the holder body 22, towards the holder body.
[0062] Here, the connector holder 2 is an integral element made of
a synthetic resin; however, in the present invention, this is not
limiting, and the connector holder 2 can be formed by plural
elements.
[0063] The holder body 22 is formed having a U-shape in
cross-section, and the inside thereof forms a groove-shaped
accommodation recess 22a that accommodates the optical connector 3
so that it can be extracted. That is, the holder body 22 includes a
bottom wall 22e, and side walls 22b and 22c erected on this bottom
wall 22e and disposed on both sides thereof via the accommodation
recess 22a.
[0064] Note that in the connector holder equipped optical connector
1, the connector holder 2 accommodates the optical connector 3 in
the accommodation recess 22a, and furthermore, by wedging the
insertion members 21 between the elements 31c and 321 of the
clamping portion 32, it becomes attached to the optical connector 3
to form a portion of the connector holder equipped optical
connector 1. However, the connector holder 2 can also serve as an
independent tool, for example, in the operation of releasing the
optical connector already attached to the distal end of an optical
fiber from the optical fiber.
[0065] Note that the bottom wall 22e of the holder body 22 is
divided into two parts by the slit 28, and the insertion members 21
project into the accommodation recess 22a through the slit 28.
However, the structure (insertion member window) for allowing the
insertion members 21 to project into the accommodation recess 22a
from the insertion member operating portion 23 is not limited to
the slit 28 that divides the bottom wall 22e into two parts. For
example, a small hole may be bored into the bottom wall 22e. The
insertion members 21 are disposed so as to pass through the
insertion member window, but the insertion member window does not
hinder the movement of the insertion members 21 caused by the
deformation of the insertion member operating portion 23.
[0066] Concretely, the insertion member operating portion 23 is
formed by the movable end portion 24 and a pair of side portions
25a and 25b (hereinafter referred to as joining wall portions) that
join between the movable end portion 24 and the holder body 22. The
joining wall portions 25a and 25b have an L-shape, and the inner
corners of the curved part of the L-shape of each of the joining
wall portions 25a and 25b face opposite each other. That is, the
curved portions connects the holder body 22 to the movable end
portion 24 in such a manner that the curved portions project
outwardly at positions between the holder body 22 and the movable
end portion 24.
[0067] The pair of joining wall portions 25a and 25b project from
the bottom wall 22e of the holder body 22 in a direction opposite
to that of the side walls 22b and 22c, and the distal end of this
projection joins with the movable end portion 24. The movable end
portion 24 has a plate shape, and the distal end of the projection
from the holder body 22 of the joining wall portions 25a and 25b
joins with both sides that are opposite to the movable end portion
24. The movable end portion 24 is supported by the pair of joining
wall portions 25a and 25b so as to be substantially parallel to the
plate-shaped bottom wall 22e of the holder body 22.
[0068] The insertion member operating portion 23 in the present
embodiment is formed so as to be right-left symmetrical, as shown
in FIG. 3 and FIG. 4. At the point where the linear movement of the
insertion members 21 is stably maintained, it is preferable that
both side portions (joining wall portions 25a and 25b) of the
insertion member operating portion 23 be symmetrical while having
the insertion members 21 therebetween.
[0069] The insertion member operating portion 23 and the bottom
wall 22e of the holder body 22 form an operating structure having a
substantially hexagonal sleeve-shaped in cross-section. Here, the
insertion member operating portion 23 specifically has a
substantially C-shape projecting from the holder body 22. However,
in the present invention, "ring-shaped", which denotes the shape of
the insertion member operating portion 23 may also denote a general
shape that expands from the holder body 22, such as a circular
shape, an elliptical shape, a rhombus shape, a C-shape. In
addition, the operating structure formed by the insertion member
operating portion 23 and the holder body 22 (specifically, the
bottom wall 22e) also has a "ring shape", such as a circle,
ellipse, rhombus, or C-shape.
[0070] However, another possible structure for the insertion member
operating portion (and the operating structure) is one in which
side portions (the joining wall portions in the present embodiment)
that join between the holder body 22 and the movable end portion 24
are formed between the holder body 22 and the movable end portion
24 so as to project outwardly, and by making both sides (joining
wall portions) approach each other due to the pressing force
(lateral pressure) from both opposing sides, the distance between
the holder body 22 and the movable end portion 24 increases, and
the insertion members 21 move in the direction in which the
dimension of the projection towards the accommodation recess 22a
(in other words, the dimension of the projection from the stopper
wall) decreases (or the projection is eliminated).
[0071] On this point, for example, the insertion member operating
portion can have a long narrow structure or the like that extends
along the insertion members 21, and it is not always necessary, as
shown in the examples in the figures that the insertion member
operating portion have a structure in which both side portions that
join between the holder body 22 (more specifically, the bottom wall
22e that functions as stopper wall) and the movable end portion 24
greatly overhangs on both sides of the insertion members 21.
[0072] In addition, any stopper wall can be used in which, when the
insertion members 21 is moved by applying lateral pressure from
both sides opposite to the insertion member operating portion to
make both side portions (joining wall portions) approach each
other, the movement of the optical connector 3 (specifically, the
clamping portion 32) trailing the insertion members 21 is
restricted, and thereby release of the insertion members 21 from
between the elements of the clamping portion 32 can be realized.
The bottom wall 22e in the example in the figure is not limiting,
and for example, may be a pin-shaped projection.
[0073] The insertion member operating portion 23 will be concretely
explained.
[0074] The insertion member operating portion 23 has a structure in
which the four joining plate portions 26a to 26d and the movable
end portion 24 join in one series. Among the four connecting plate
portions 26a to 26d, the connecting plates denoted by the reference
symbols 26a and 26b form one joining wall portion 25a and the
connecting plates denoted by the reference symbols 26c and 26d form
the other joining wall portion 25b. Among the connecting plate
portions 26a to 26d that join in a row and the movable end portion
24, which joins in series with the connecting plates 26a and 26d
positioned at both ends join with both opposite sides of the holder
body 22 (specifically, the bottom wall 22e), and thereby a sleeve
that has a substantially hexagonal shape in cross-section is formed
by the insertion member operating portion 23 and the bottom wall
22e.
[0075] A thin walled portion 27 that deforms easily due to being
thin in comparison to the connecting plates 26a to 26d and the
movable end portion 24 joins the joining plates 26a and 26d and the
holder body 22 (specifically, the bottom wall 22e), between the
connecting plate 26a and the connecting plate 26d, and between the
connecting plates 26b and 26c and the movable end portion 24, and
this thin walled portion 27 functions like a hinge (functions as a
hinge) due to the deformation. Thereby, the relative angle between
the connecting plates 26a and 26d and the holder body 22
(specifically, the bottom wall 22e), between the connecting plate
26a and the connecting plate 26b, between the connecting plate 26c
and the connecting plate 26d, and between the connecting plates 26b
and 26c and the movable end portion 25 becomes changeable.
[0076] As described above, in the connector holder equipped optical
connector 1, the insertion members 21 of the connector holder 2 are
inserted between the extension portion 31c and the lid side
elements 321 and 322, and the extension portion 31c and the lid
side elements 321 and 322 are slightly pushed apart due to
resisting the elasticity of the spring 322. The connector holder 2
also functions as the release mechanism according to the present
invention. In this state, it is possible to insert and release the
optical fiber 4 (second optical fiber) between the pair of elements
31c and 321 of the clamping portion 32 from the back end side of
the optical connector 3.
[0077] Here, as illustrated in FIG. 7, a single core type optical
fiber core wire is used as the optical fiber 4. The projecting
portion 38a, which is the part of the optical fiber 38 (the first
optical fiber; also referred to below as the optical fiber on the
ferule side) inserted and fastened in the ferule 31 that projects
from the back end of the ferule 31, is inserted between the pair of
elements 31c and 321 of the clamping portion 32, and when the
optical fiber 4 is inserted between the pair of elements 31c and
321 from the back end side of the clamping portion 32, it is
possible to abut connect it to the optical fiber 38 (more
specifically, the projecting portion 38a).
[0078] Note that the optical fiber is not limited to an optical
fiber core wire, but, for example, an optical fiber wire, optical
fiber cord or the like may be used.
[0079] In addition, the optical fiber in the present embodiment is
a silicon glass optical fiber.
[0080] Specifically, to connect the optical fibers 4 and 38
together in the clamping portion 32, the distal end, at which the
bare optical fiber 4a is exposed, is inserted from the back end
side of the clamping portion 32 into the grooves 325a and 325b
formed in the abutment surfaces of either one or both of the pair
of elements 31c and 321 of the clamping portion 32 (here, formed on
both the abutment surface 324a of the element 31c and the abutment
surface 324b of the element 321b; refer to FIGS. 6, 8, and the
like). These grooves 325a and 325b are formed in the pair of
elements 31c and 321 at locations exactly opposing each other,
accommodate a covered portion of the optical fiber 4, and have a
shape that enables secure clamping of the covered portion of the
optical fiber 4 due to the elasticity (clamping force) of the
spring 322 when the insertion members 21 are released from the
clamping portion 32.
[0081] The grooves 325a and 325b are formed so as to extend from
the opening portion 325c that opens in the back end side of the
clamping portion 32 towards the ferule 31, and the end portion on
the ferule 31 side communicates with the aligning groove 323 formed
on the abutment surface of one or both of the pair of elements 31c
and 321 of the clamping portion 32 (here, only the abutment surface
324a of the element 31c). In the aligning groove 323, the optical
fiber 38 on the ferule side (here, the bare optical fiber) is
accommodated and precisely positioned and aligned.
[0082] When the optical fiber 4 that has been pushed into the
grooves 325a and 325b is pushed further towards the ferule 31 side,
the bare optical fiber 4a at the distal end of the optical fiber 4
can be inserted into the aligning groove 323 from the grooves 325a
and 325b, and in the aligning groove 323, the optical fiber 38 on
the ferule side (specifically, the distal end of the projection
38a) can be abutment connected in a state of precision positioning
and alignment due to the alignment precision of the alignment
groove 323. Here, this aligning groove is a V-groove, but for
example, any type of structure such as a U-groove, a round groove
(a groove with a semi-circular cross-section) or the like can be
used.
[0083] When the abutment connection between optical fibers 4 and 38
has been completed, the connector holder 2 is released from the
optical connector 3. In this release operation, the optical
connector 3 can be extracted from the accommodation recess 22a
between both the side walls 22b and 22c of the connector holder
2.
[0084] Specifically, when a pushing force (lateral pressure) acts
from both opposing sides on the part positioned between the movable
end portion 24 and the holder body 22 and the insertion member
operating portion 23 approaches the area between the joining wall
portions 25a and 25b on both sides, due to the deformation as a
whole, the distance between the movable end portion 24 and the
holder body 22 increases (refer to FIG. 4). Thereby, because the
insertion members 21 move in the direction in which amount of
projection into the accommodation recess 22a from the bottom wall
22e is decreased (or the projection from the bottom wall 22e is
eliminated), the insertion members 21 that are inserted between the
elements can be extracted. At this time, the bottom wall 22e
functions as a stopper wall that regulates optical connector 3
moving together with the insertion members 21, and thus the
extraction of the insertion members 21 from between the elements
can be realized smoothly.
[0085] Here, the joining wall portions 25a and 25b on both sides
are symmetrically formed due to the space (inside space S) on the
inside of the insertion member operating portion 23, and the four
connecting plate portions 26a to 26d and the movable end portion 24
are shifted due to the function of the plurality of thin walled
portions 27 (functioning as hinge parts due to the deformation).
From the state in which the joining wall portions 25a and 25b on
both sides have deformed equally (from the state of the L-shaped
curvature gradually to the straight line, as shown in FIG. 4), the
insertion members 21 move linearly with respect to the clamping
portion 32 of the optical connector 3, which is supported by the
holder body 22, to be extracted from between the elements 31c and
321. Thus, there is no concern that the elements 31c and 321 of the
clamping portion 32 will be damaged due to the incline of the
insertion members 21 during extraction.
[0086] The movement of the insertion members 21 with respect to the
clamping portion 32 is a linear movement along the extension of the
border between the pair of elements 31c and 321. In addition, in
the optical connector 3, because the insertion members 21 are
wedged between the elements 31c and 321, the insertion member
insertion recess 325d formed on the side portions of the elements
31c and 321 face the surface opposite to the movable end portion 24
of the insertion member operating portion 23. Because the holder
body 22 is firmly supported so that position misalignment will not
occur, while extracting the insertion members 21, the inconvenience
that the insertion members 21 apply a deformation pressure or the
like to the pair of elements 31c and 321 occurs with difficulty.
Furthermore, because the inconvenience that the needless increase
in the extraction resistance of the insertion members 21 from the
pair of elements 31c and 321 occurs with difficulty, the extraction
can be carried out with a small force.
[0087] Note that any type of structure can be used for the
insertion member operating portion 23, but as described above, the
insertion member operating portion 23 preferably has a structure
wherein a pressing force (lateral pressure) acts from both opposite
sides on the part located between the movable end portion 24 and
the holder body 22, and when the insertion members 21 approach the
joining wall portions 25a and 25b that are on both sides, the
joining wall portions 25a and 25b on both sides deform equally, the
insertion members 21 moves linearly with respect to the clamping
portion 32 of the optical connector 3 supported by the holder body
22, and the insertion members 21 can be extracted from between the
elements 31c and 321.
[0088] In addition, because the amount of movement of the movable
end portion 24 with respect to the holder body 22 is smaller than
the amount of change in the distance between the joining wall
portions 25a and 25b due to approach of the joining wall portions
25a and 25b (more specifically, for example, the amount of change
in the distance between the thin walled portions 27 that join the
joining plates in the joining wall portions 25a and 25b), the
insertion member operating portion 23 functions as a force
amplifying mechanism that converts the lateral pressure into the
extraction force for extracting the insertion members 21 from the
apace between the elements.
[0089] When the release operation has completed, the insertion
members 21 of the connector holder 2 are extracted from between the
pair of elements 31c and 321, and the optical fibers 4 and 38 are
clamped and fastened between the pair of elements 31c and 321 due
to the elasticity of the spring 322 so as to be inserted
therebetween. Thus, the connection state between the optical fibers
4 and 38 is maintained. Thereby, the optical connector 3 is
attached to the distal end of the optical fiber 4.
[0090] According to the invention of the present application, the
connector holder equipped optical connector 1 can attach the
optical connector 3 to the distal end of the optical fiber 4
without using a conventional dedicated tool. In addition, the
connector holder 2 has an extremely simple structure, and
furthermore, can be manufactured inexpensively. Thus, in comparison
to using a dedicated tool, a significant cost reduction can be
realized. Furthermore, after the connector holder 2 has been
attached to the optical connector 3 and the optical fiber 4 has
been inserted into the clamping portion 32, simply by releasing the
connector holder 2 from the optical connector 3, it is possible to
realize the attachment of the of the optical connector 3 to the
distal end of the optical fiber 4. Thus, the operation in which
precise positioning and support are carried out so that the optical
connector is inserted into the holder portion, which is required in
the case in which a conventional dedicated tool is used, becomes
unnecessary, and the attachment operation becomes extremely
simple.
[0091] The thin walled portion 27 used as a hinge part elastically
deforms due to the lateral pressure applied by the insertion member
operating portion 23, and thus when the lateral pressure is
released and the optical connector is extracted from the holder
body, due to the elasticity of the thin walled portion 27, the
shape prior to the application of lateral pressure to the insertion
member operating portion 23, that is the shape shown in the
examples in FIG. 1 to FIG. 3, is restored. Therefore, use for the
attachment of the optical connector to the holder body again and
the attachment of the connector holder equipped optical connector
is also easy.
[0092] Note that the concrete structure of the connector holder and
the connector holder equipped optical connector according to the
present invention are not limited by the embodiment described
above, and may have various modifications.
[0093] The hinge part is not limited to the thin walled portion 27
described above, but for example, a structure that uses a hinge or
the like can also be used. As a insertion member operating portion,
in addition to the structure in which a part of the connector
holder equipped optical connector 1 is integrally formed by resin
along with the holder body illustrated in the embodiment described
above, a structure can be used in which, for example, a plurality
of members that include a plurality of plate shaped members and a
pin that pivotally fits these plate shaped members together are
attached in a ring shape.
[0094] The number of the insertion members erected on the movable
end portion 24 is not limited to the two illustrated in FIG. 2 or
the like, but three or more can be used. In addition, as
illustrated in FIG. 9, a structure is used in which the plurality
of insertion members are formed on the distal end of the projection
from the movable end portion 24 of the plate shaped insertion part
member body 29 erected from the movable end portion 24. In the
connector holder illustrated in the embodiment described above, the
position of the distal ends of the two insertion members 21 are
aligned together and the insertion depth with respect to the
clamping portion of the optical connector supported by the holder
body is also the same. However, in the present invention this is
not limiting, and a structure can be used in which the projection
dimensions of the plurality of insertion members from the movable
end portion differ.
[0095] In addition, the plurality of insertion members is
structured so that the thickness of the parts (distal ends)
inserted into the clamping portion of the optical connector are
uniformly aligned, but this is not limiting. A structure can be
used in which the thickness differs corresponding to the amount of
opening of the elements when inserted into the element. The amount
of opening when an insertion member is inserted into an element
corresponds to the thickness of the optical fiber inserted between
the elements, and is determined such that the insertion of the
optical fiber is possible.
[0096] For example, the thickness of the optical fiber is different
at the bare optical fiber 4a exposed by removing the cover of the
distal end of the optical fiber 4 illustrated in the embodiment
described above and a portion where the bare optical fiber 4a is
not exposed (the covered portion), and thus in the plurality of
insertion members, the thickness of the part (distal end) that is
inserted into the clamping portion of the optical connector differs
corresponding to the thickness of the optical fiber, and thus it is
possible to determine the opening of the element that corresponds
to differences in the thickness of parts of an optical fiber.
[0097] In addition, it is possible for there to be only one
insertion member. For example, the part (distal end) inserted into
the clamping portion of the optical connector can use one plate
shaped insertion member that extends along the alignment axis of
the aligning groove.
[0098] As illustrated in FIG. 3 and FIG. 4, the concrete shapes of
the distal end of an insertion member are shapes that have curved
surfaces (in order to make the element difficult to damage).
However, as illustrated in FIG. 10A and FIG. 10B, the distal end
can have various types of shape, such as a pointed shape, a shape
in which a sloped surface symmetrical from the distal end on both
sides is formed, or a shape in which a slope surface from the
distal end having only one side is formed can be used.
[0099] In addition, an optical connector 3 (optical connector plug)
applied to the present invention is not limited to a connector for
a single core type optical fiber core wire, but a connector for a
multiple-core type optical fiber core wire can also be used. In the
case of using a connector for a multiple-core type optical fiber
core wire, a structure in which there is a plurality of aligning
grooves formed on the elements of the clamping portion is
employed.
[0100] Next, another embodiment of the connector holder 2 and a
retainer for supporting the optical connector inside the connector
holder will be explained with reference to FIGS. 11 through 15.
[0101] The connector holder 102 shown in FIGS. 11 and 13 to 15
differs from the connector holder 2 described above in that the
bottom wall 122e is offset in the vertical direction in the figure
with respect to the thin walled portion 127a that approaches the
bottom wall 122e, that is, the point that the insertion member
operating portion 123 is a polygonal shape having a concave part
when seen from the direction extending along the recess 122a that
accommodates the optical connector 3, and the point that an
engagement groove 110 that can engage with the arm 52 of the
retainer 50 shown in FIGS. 12, 14, and 15 is formed.
[0102] Like the connector holder 2 shown in FIG. 2, the connector
holder 102 includes a holder body 122, an insertion member
operating portion 123, and a recess 122a that accommodates the
optical connector 3. The insertion member operating portion 123
includes thin walled portions 127a, 127b, and 127c, and thereby is
easily deformable. The bottom wall 122e, which acts as the bottom
wall of the recess 122a, is offset in the vertical direction in the
figure with respect to the thin walled portion 127a that approaches
the bottom wall 122e and is offset in the direction that approaches
to the movable end portion 124.
[0103] Accompanying this, in the insertion member body 129 that
projects from the movable end portion 125 in the insertion member
operating portion 123, the length in the projection direction with
respect to the insertion member operating portion 29 of the
connector holder 2 is made short. The holder body 122 includes a
pair of side walls 122b and 122c, and an engagement groove 110 that
extends parallel (the direction perpendicular to the plane of FIG.
13) to the axis of the connector holder 102 is formed on the
outside surface of each of the side walls 122b and 122c.
[0104] The retainer 50 shown in FIGS. 12, 14, and 15 is provided in
order to support the optical connector 3 in the recess 122a of the
connector holder 102 during delivery. The retainer 50 includes a
retainer body 51 having a substantially rectangular shape in plan
view and a pair of arms 52 that connect to one end of the lock
lever body 51 and extend towards the other edge of the retainer
body 51 in a cantilever state. The cross-sectional shape of each of
the arms 52 perpendicular to the direction of the extension is
rectangular. In addition, a grip part 53 having the shape of
triangular waves in a planar view are formed in each of the arms
52, outside the part that connects to the retainer body 51. As
shown in FIG. 14, on the lower surface of the retainer 51, a
plurality (three in the illustrated embodiment) of projections 54
are formed.
[0105] The external dimensions of the arms 52 of the retainer 50
and the dimensions of the engagement groove 110 of the connector
holder 102 are determined such that when the elastic deformation of
each is used the connector holder 102 and the retainer 50 do not
readily release due to vibration. The material of the retainer 105
is preferably a synthetic resin identical to that of the connector
holder 102, but this is not limiting.
[0106] Next, the operation from the assembly steps at the
production factory up to the optical connection of the pair of
optical fibers will be explained with reference to FIG. 13 and FIG.
14. In FIGS. 13 and 14, the optical connector 3 is identical to
that shown in FIG. 3 and the like, and thus the detailed
explanation of the structure thereof will be omitted.
[0107] In the production factory, before shipping, the optical
connector 3 is disposed inside the recess 122a of the connector
holder 102, then the insertion members 12 are inserted through the
insertion opening of the stop ring 34 from outside the optical
connector 3 the movable end portion 124 is pushed towards the
optical connector 3 while holding the optical connector 3, the
insertion members 121 are wedged between the pair of elements 31c
and 321, and thereby the state shown in FIG. 13 is realized. Due to
this operation, the lower end portions of the elements 31c and 321
become slightly separated while resisting the elasticity of the
spring 322 (this gap is not shown in FIG. 13 because it is very
small), a gap opens in the vicinity of the optical fiber 38, to
release the optical fiber 38 that is being held.
[0108] Next, the retainer 50 is slid along the direction of arrow A
shown in FIGS. 12 and 15 while the gripping part 53 is gripped, and
the pair of arms 52 are engaged in the engagement groove 110 of the
connector holder 102. At this time, due to the projection 54 that
is formed on the lower surface of the retainer 50, the upper
surface of the optical connector 3 is slightly pressed, and the
optical connector 3 is held in the recess 122a so as to have no
play. Therefore, during the delivery after being shipped from the
factory, the optical connector 3 is reliably held in the recess
122a.
[0109] After delivery, at the connection site, the optical fiber 38
and the other optical fiber (not illustrated) to be optically
connected are disposed in the groove formed in the element 31c, and
the ends of the optical fibers are abutted to each other.
[0110] Next, a pressing force (lateral force) is applied in
opposite directions to the part positioned between the movable end
portion 124 and the holder body 122 in the insertion member
operating portion 123, that is, the part in proximity to the thin
walled portions 127b, the insertion member body 129 is moved
downward in the figure, and the insertion members 121 are extracted
from between the elements 31c and 321. As a result, the elements
31c and 321 are brought into contact due to the restoring force of
the spring 322, and the optical fiber 38 and the optical fiber not
illustrated are held in an optically connected state between the
elements 31c and 321.
[0111] Next, in an operation that is the reverse of that in the
production factory, the retainer 50 is slid in the direction of
arrow B shown in FIGS. 12 and 15 while the part 53 is gripped, the
arm 52 are released from the engagement grooves 110 of the
connector holder 102, and the optical connector 3 is removed from
the recess 122a of the connector holder 102.
[0112] The retainer 50 can be recovered and reused because it is
only slightly elastically deformed during use.
[0113] According to the connector holder 102 and the retainer 50
having the structure described above, when being conveyed from the
production factory to the connection site in the field, the optical
connector 3 can be reliably held in the recess 122a.
[0114] In addition, because the bottom wall 122e is offset in the
vertical direction in the figure with respect to the thin walled
portions 127a that approach the bottom wall 122e, assuming that the
same type of optical connector 3 is being held, in comparison to
the connector holder 2 in the embodiment described above, it is
possible to keep the overall height H (shown in FIG. 14) of the
connector holder 102 low, and thus the space use efficiency during
delivery can be improved.
[0115] Note that in the above description, the optical connector 3
is held by pressing the upper surface of the optical connector 3 by
the projection 54 of the retainer 50, but it is possible to use a
structure in which a gap is provided between the upper surface of
the optical connector 3 and the lower surface of the retainer 50.
In this case, the dimension of the gap is determined such that the
insertion members 121 are not extracted from the gap between the
elements 31c 321 even when the optical connector 3 is moved
vertically in the recess 122a.
[0116] FIG. 16 shows an example in which a retainer 150 having a
shape that differs from that of the retainer 50 in the embodiment
described above in order to hold the optical connector 3 in the
connector holder 2 shown in FIG. 3 more reliably in the recess
22a.
[0117] A convexity 22d that projects towards the recess 22a and
extends parallel (the direction perpendicular to the plane of FIG.
15) to the axis of the connector holder 2 is formed on the
respective upper end portions of the pair of side walls 22b and 22c
of the holder body 22: The retainer 150 is a substantially flat
plate shaped member, and like the retainer 50, on the lower surface
a plurality (three in the embodiment in the figures) of projections
154 are formed.
[0118] The retainer 150 is slid and inserted into the recess 22a
along the axial direction of the connector holder 2 after the
optical connector 3 is disposed in the recess 22a and the insertion
members 21 is inserted between the elements 31c and 321 while the
projection 154 is brought into contact with the upper surface of
the optical connector 3. The thickness (height) of the retainer 150
is determined such that, after insertion, the upper corner portion
150a of the retainer 150 abuts the convexity 22d and the projection
154 abuts the upper surface of the optical connector 3, and
thereby, the optical connector 3 is held in the recess 22a due to
the shape of the retainer 150 elastically deforming slightly.
[0119] In addition, the width (the length in the horizontal
direction in FIG. 15) of the retainer 150 is set so as to match the
width of the recess 22a substantially but not interfere with the
sliding and insertion of the retainer 150 into the recess 22a. The
material of the retainer 150 is preferably a synthetic resin
identical to that of the connector holder 2, but is not limited
thereby.
[0120] Next another embodiment of the connector holder will be
explained with reference to FIG. 17.
[0121] The connector holder 202 shown in FIG. 17 resembles the
connector holder 2 shown in FIGS. 1 to 3. However, the connector
holder 202 differs from the connector holder 2 in that a slit 210
is formed in a pair of joining wall portions 225a and 225b and a
movable end portion 224 included in the insertion member operating
portion 223 at a position between the two insertion member bodies
229.
[0122] The slit 210 is formed so as to be continuous from the
movable end portion 224 to the thin walled portion 227a through the
thin walled portion 227b of each of the joining wall portions 225a
and 227b. Due to this structure, one set consisting of the joining
wall portions 225a and 227b and the insertion member body 229 can
shift independently from the other set.
[0123] Therefore, in the case in which the optical connector 3 is
accommodated in the recess 222a and each of the inserted insertion
members 221 are extracted from between the elements 31c and 321,
while the one insertion member 221 is held in the state of
penetration between the elements 31c and 321, it is possible to
extract the other insertion member 221 from between the elements
31c and 321. In this manner, because it is possible to prevent
unnecessary vibration of the elements 31c and 321 due to one of the
insertion members 221, there is the advantage of the positioning
precision of the optical fiber.
[0124] In the present invention, in the "optical connector" denotes
optical parts generally that use an abutment connection between
optical fibers (this is not necessarily limited to a connection in
which the end surfaces of the optical fibers are brought together,
and includes the optical fibers being optically connected together
in opposition to each other via a small gap), but is not
necessarily limited to using a ferule. In addition, the optical
connector according to the present invention has a clamping portion
that clamps the optical fibers that are abutment connected and
maintains the connected state, and optical connectors that have
such a clamping portion are referred to as "optical connectors" in
the present invention.
[0125] The present invention has as an object carrying out simply
and quickly the attachment of an optical connector to the distal
end of an optical fiber, and can be applicable to any type of
optical connectors. In addition, the present invention can be used
in an optical connector that is included in an apparatus or
mechanism.
[0126] While preferred embodiments of the invention have been
described and illustrated above, it should be understood that these
are exemplary of the invention and are not to be considered as
limiting. Additions, omissions, substitutions, and other
modifications can be made without departing from the spirit or
scope of the present invention. Accordingly, the invention is not
to be considered as being limited by the foregoing description, and
is only limited by the scope of the appended claims.
* * * * *